include/wx/msw/registry.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/msw/registry.h
   3 // Purpose:     Registry classes and functions
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     03.04.1998
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_MSW_REGISTRY_H_
  13 #define _WX_MSW_REGISTRY_H_
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_REGKEY
  18
  19 class WXDLLIMPEXP_FWD_BASE wxOutputStream;
  20
  21 // ----------------------------------------------------------------------------
  22 // class wxRegKey encapsulates window HKEY handle
  23 // ----------------------------------------------------------------------------
  24
  25 class WXDLLIMPEXP_BASE wxRegKey
  26 {
  27 public:
  28   // NB: do _not_ change the values of elements in these enumerations!
  29
  30   // registry value types (with comments from winnt.h)
  31   enum ValueType
  32   {
  33     Type_None,                       // No value type
  34     Type_String,                     // Unicode nul terminated string
  35     Type_Expand_String,              // Unicode nul terminated string
  36                                      // (with environment variable references)
  37     Type_Binary,                     // Free form binary
  38     Type_Dword,                      // 32-bit number
  39     Type_Dword_little_endian         // 32-bit number
  40         = Type_Dword,                // (same as Type_DWORD)
  41     Type_Dword_big_endian,           // 32-bit number
  42     Type_Link,                       // Symbolic Link (unicode)
  43     Type_Multi_String,               // Multiple Unicode strings
  44     Type_Resource_list,              // Resource list in the resource map
  45     Type_Full_resource_descriptor,   // Resource list in the hardware description
  46     Type_Resource_requirements_list  // ???
  47   };
  48
  49   // predefined registry keys
  50   enum StdKey
  51   {
  52     HKCR,       // classes root
  53     HKCU,       // current user
  54     HKLM,       // local machine
  55     HKUSR,      // users
  56     HKPD,       // performance data (WinNT/2K only)
  57     HKCC,       // current config
  58     HKDD,       // dynamic data (Win95/98 only)
  59     HKMAX
  60   };
  61
  62   // access mode for the key
  63   enum AccessMode
  64   {
  65       Read,     // read-only
  66       Write     // read and write
  67   };
  68
  69   // Different registry views supported under WOW64.
  70   enum WOW64ViewMode
  71   {
  72       // 32 bit registry for 32 bit applications, 64 bit registry
  73       // for 64 bit ones.
  74       WOW64ViewMode_Default,
  75
  76       // Can be used in 64 bit apps to access 32 bit registry,
  77       // has no effect (i.e. treated as default) in 32 bit apps.
  78       WOW64ViewMode_32,
  79
  80       // Can be used in 32 bit apps to access 64 bit registry,
  81       // has no effect (i.e. treated as default) in 64 bit apps.
  82       WOW64ViewMode_64
  83   };
  84
  85   // information about standard (predefined) registry keys
  86     // number of standard keys
  87   static const size_t nStdKeys;
  88     // get the name of a standard key
  89   static const wxChar *GetStdKeyName(size_t key);
  90     // get the short name of a standard key
  91   static const wxChar *GetStdKeyShortName(size_t key);
  92     // get StdKey from root HKEY
  93   static StdKey GetStdKeyFromHkey(WXHKEY hkey);
  94
  95   // extracts the std key prefix from the string (return value) and
  96   // leaves only the part after it (i.e. modifies the string passed!)
  97   static StdKey ExtractKeyName(wxString& str);
  98
  99   // ctors
 100     // root key is set to HKCR (the only root key under Win16)
 101     wxRegKey(WOW64ViewMode viewMode = WOW64ViewMode_Default);
 102
 103     // strKey is the full name of the key (i.e. starting with HKEY_xxx...)
 104     wxRegKey(const wxString& strKey,
 105         WOW64ViewMode viewMode = WOW64ViewMode_Default);
 106
 107     // strKey is the name of key under (standard key) keyParent
 108     wxRegKey(StdKey keyParent,
 109         const wxString& strKey,
 110         WOW64ViewMode viewMode = WOW64ViewMode_Default);
 111
 112     // strKey is the name of key under (previously created) keyParent
 113   wxRegKey(const wxRegKey& keyParent, const wxString& strKey);
 114     // dtor closes the key
 115  ~wxRegKey();
 116
 117   // change key (closes the previously opened key if any)
 118     // the name is absolute, i.e. should start with HKEY_xxx
 119   void  SetName(const wxString& strKey);
 120     // the name is relative to the parent key
 121   void  SetName(StdKey keyParent, const wxString& strKey);
 122     // the name is relative to the parent key
 123   void  SetName(const wxRegKey& keyParent, const wxString& strKey);
 124     // hKey should be opened and will be closed in wxRegKey dtor
 125   void  SetHkey(WXHKEY hKey);
 126
 127   // get infomation about the key
 128     // get the (full) key name. Abbreviate std root keys if bShortPrefix.
 129   wxString GetName(bool bShortPrefix = true) const;
 130     // Retrieves the registry view used by this key.
 131     WOW64ViewMode GetView() const { return m_viewMode; }
 132     // return true if the key exists
 133   bool  Exists() const;
 134     // get the info about key (any number of these pointers may be NULL)
 135   bool  GetKeyInfo(size_t *pnSubKeys,      // number of subkeys
 136                    size_t *pnMaxKeyLen,    // max len of subkey name
 137                    size_t *pnValues,       // number of values
 138                    size_t *pnMaxValueLen) const;
 139     // return true if the key is opened
 140   bool  IsOpened() const { return m_hKey != 0; }
 141     // for "if ( !key ) wxLogError(...)" kind of expressions
 142   operator bool()  const { return m_dwLastError == 0; }
 143
 144   // operations on the key itself
 145     // explicitly open the key (will be automatically done by all functions
 146     // which need the key to be opened if the key is not opened yet)
 147   bool  Open(AccessMode mode = Write);
 148     // create the key: will fail if the key already exists and !bOkIfExists
 149   bool  Create(bool bOkIfExists = true);
 150     // rename a value from old name to new one
 151   bool  RenameValue(const wxString& szValueOld, const wxString& szValueNew);
 152     // rename the key
 153   bool  Rename(const wxString& szNewName);
 154     // copy value to another key possibly changing its name (by default it will
 155     // remain the same)
 156   bool  CopyValue(const wxString& szValue, wxRegKey& keyDst,
 157                   const wxString& szNewName = wxEmptyString);
 158
 159     // copy the entire contents of the key recursively to another location
 160   bool  Copy(const wxString& szNewName);
 161     // same as Copy() but using a key and not the name
 162   bool  Copy(wxRegKey& keyDst);
 163     // close the key (will be automatically done in dtor)
 164   bool  Close();
 165
 166   // deleting keys/values
 167     // deletes this key and all of it's subkeys/values
 168   bool  DeleteSelf();
 169     // deletes the subkey with all of it's subkeys/values recursively
 170   bool  DeleteKey(const wxString& szKey);
 171     // deletes the named value (may be empty string to remove the default value)
 172   bool DeleteValue(const wxString& szValue);
 173
 174   // access to values and subkeys
 175     // get value type
 176   ValueType GetValueType(const wxString& szValue) const;
 177     // returns true if the value contains a number (else it's some string)
 178   bool IsNumericValue(const wxString& szValue) const;
 179
 180     // assignment operators set the default value of the key
 181   wxRegKey& operator=(const wxString& strValue)
 182     { SetValue(wxEmptyString, strValue); return *this; }
 183
 184     // query the default value of the key: implicitly or explicitly
 185   wxString QueryDefaultValue() const;
 186   operator wxString() const { return QueryDefaultValue(); }
 187
 188     // named values
 189
 190     // set the string value
 191   bool  SetValue(const wxString& szValue, const wxString& strValue);
 192     // retrieve the string value
 193   bool  QueryValue(const wxString& szValue, wxString& strValue) const
 194     { return QueryValue(szValue, strValue, false); }
 195     // retrieve raw string value
 196   bool  QueryRawValue(const wxString& szValue, wxString& strValue) const
 197     { return QueryValue(szValue, strValue, true); }
 198     // retrieve either raw or expanded string value
 199   bool  QueryValue(const wxString& szValue, wxString& strValue, bool raw) const;
 200
 201     // set the numeric value
 202   bool  SetValue(const wxString& szValue, long lValue);
 203     // return the numeric value
 204   bool  QueryValue(const wxString& szValue, long *plValue) const;
 205     // set the binary value
 206   bool  SetValue(const wxString& szValue, const wxMemoryBuffer& buf);
 207     // return the binary value
 208   bool  QueryValue(const wxString& szValue, wxMemoryBuffer& buf) const;
 209
 210   // query existence of a key/value
 211     // return true if value exists
 212   bool HasValue(const wxString& szKey) const;
 213     // return true if given subkey exists
 214   bool HasSubKey(const wxString& szKey) const;
 215     // return true if any subkeys exist
 216   bool HasSubkeys() const;
 217     // return true if any values exist
 218   bool HasValues() const;
 219     // return true if the key is empty (nothing under this key)
 220   bool IsEmpty() const { return !HasSubkeys() && !HasValues(); }
 221
 222   // enumerate values and subkeys
 223   bool  GetFirstValue(wxString& strValueName, long& lIndex);
 224   bool  GetNextValue (wxString& strValueName, long& lIndex) const;
 225
 226   bool  GetFirstKey  (wxString& strKeyName  , long& lIndex);
 227   bool  GetNextKey   (wxString& strKeyName  , long& lIndex) const;
 228
 229   // export the contents of this key and all its subkeys to the given file
 230   // (which won't be overwritten, it's an error if it already exists)
 231   //
 232   // note that we export the key in REGEDIT4 format, not RegSaveKey() binary
 233   // format nor newer REGEDIT5 one
 234   bool Export(const wxString& filename) const;
 235
 236   // same as above but write to the given (opened) stream
 237   bool Export(wxOutputStream& ostr) const;
 238
 239
 240   // for wxRegConfig usage only: preallocate some memory for the name
 241   void ReserveMemoryForName(size_t bytes) { m_strKey.reserve(bytes); }
 242
 243 private:
 244   // common part of all ctors
 245   void Init()
 246   {
 247     m_hKey = (WXHKEY) NULL;
 248     m_dwLastError = 0;
 249   }
 250
 251   // recursive helper for Export()
 252   bool DoExport(wxOutputStream& ostr) const;
 253
 254   // export a single value
 255   bool DoExportValue(wxOutputStream& ostr, const wxString& name) const;
 256
 257   // return the text representation (in REGEDIT4 format) of the value with the
 258   // given name
 259   wxString FormatValue(const wxString& name) const;
 260
 261
 262   WXHKEY        m_hKey,          // our handle
 263                 m_hRootKey;      // handle of the top key (i.e. StdKey)
 264   wxString      m_strKey;        // key name (relative to m_hRootKey)
 265   WOW64ViewMode m_viewMode;      // which view to select under WOW64
 266   AccessMode    m_mode;          // valid only if key is opened
 267   long          m_dwLastError;   // last error (0 if none)
 268
 269
 270   wxDECLARE_NO_COPY_CLASS(wxRegKey);
 271 };
 272
 273 #endif // wxUSE_REGKEY
 274
 275 #endif // _WX_MSW_REGISTRY_H_
 276